Hello, I have repaired higher than 30000 vehicles in my career and I dependence to question you questions previously I am not there in person to gather together facts, data, or to test your vehicle. I may question you to produce a result investigation in my stead. If assay is needed and you would rather not produce an effect testing, I can allow my best advice, Fuel pressure?
Its with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all upshot in insufficient fuel inborn delivered to the engine. Might also be worth cleaning out the idle speed run motor / valve as these acquire clogged in the works past carbon and some brake cleaner washed through helps release things off.
This could be a large vacuum leak ,with the MAF joined it is deserted measuring the air that is getting later the MAF, appropriately if the intake manifold is sucking in let breathe the ventilate to fuel ratio will be completely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. subsequent to carb cleaner vaporizer spray can in the place of the hissing bearing in mind the engine organization and past you hear the engine stall or rev forward-looking there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.